const fp = require('lodash/fp')

const cars = [
    { name: 'Ferrati FF', horsepower: 660, dollar_value: 700000, in_stock: true },
    { name: 'Spyker C12 Zagato', horsepower: 650, dollar_value: 648000, in_stock: false },
    { name: 'Jaguar XKR-S', horsepower: 550, dollar_value: 132000, in_stock: false },
    { name: 'Audi R8', horsepower: 525, dollar_value: 114200, in_stock: false },
    { name: 'Aston Martin One-77', horsepower: 750, dollar_value: 1850000, in_stock: true },
    { name: 'Pagani Huayra', horsepower: 700, dollar_value: 1300000, in_stock: false },
]
// 01
console.log(fp.flowRight(fp.prop('in_stock'), fp.last)(cars))
// false

// 02
console.log(fp.flowRight(fp.prop('name'), fp.first)(cars))
// Ferrati FF

// 03
function _average(xs) {
    return fp.reduce(fp.add, 0, xs) / xs.length
}
console.log(fp.flowRight(_average, fp.map(fp.prop('dollar_value')))(cars))
// 790700

// 04
function sanitizeNames(arr) {
    return fp.map(fp.flowRight(fp.replace(/\s+/g, '_'), fp.toLower, fp.prop('name')))(arr)
}
console.log(sanitizeNames(cars))
/**
 * [
  'ferrati_ff',
  'spyker_c12_zagato',
  'jaguar_xkr-s',
  'audi_r8',
  'aston_martin_one-77',
  'pagani_huayra'
]
 */